John d



J 1) Russ LATHE ATTAOHMENTI Patentd July 11, 1893.

m m J UNITED STATES PATENT OFFICE.

JOHN D. RUSS, OF RAVENSWOOD, WEST VIRGINIA, ASSIGNOR TO ERNEST H.LEMLEY, OF SAME PLACE.

LATH E ATTACH M ENT.

SPECIFICATION forming part of Letters Patent No. 501,469, dated July I1,1893. Application filed September 26, 1892. Serial No. 446,917. (Nomodel.)

To all whom it may concern.-

Be it known that 1', JOHN D. RUSS, a citizen of the United States,residing at Ravenswood, in the county of Jackson and State of WestVirginia, have invented certain new and usefullmprovements in LatheAttachments; and I do hereby declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same.

This invention relates to lathe attachments.

The object of the invention is to produce a lathe attachment designedparticularly for use on jewelers lathes, and adapted for cuttingopenings for the reception of jewels in watches, &c., though capable ofuse in any other position where it is desirable to cut openings in metalof the exact size to receive articles to be set in place, and forholding an ordinary drill-tool.

The invention consists essentially in an attachment for lathes,consisting in a laterallymovable tool-bar, a pivoted lever arranged onthe frame carrying the tool-bar, an adjustable connection between thelever and the tool-bar, and a head on the lever designed to move towardand away from the tool-bar; furthermore, the invention resides invarious novel details of construction, whereby the objects of theinvention are attained.

The invention is illustrated in the accompanying drawings, in which--Figure 1 represents a lathe of ordinary construction having my improvedattachment in position thereon. Fig. 2 is a plan view of the attachment,with a cutting tool arranged in position thereon. Fig. 3 is a sideelevation of the attachment with a drill in position; and Fig. at is aperspective view of the tool-bar detached from the rest of theattachment.

In the drawings, A represents a frame provided with two side-pieces, a,a and having integral with it, a stem 01.", for the attachment of thedevice to a lathe A of suitable construction.

B represents a rod extending from the arms a and a and upon-this rod isdesigned to slide the tool-bar C. This tool bar is, as shown in Fig. 40fthe drawings, provided, in its lower end with a notch, the sides of thebar on each side of the notch, being provided with setscrews 0 wherebythe up and down adjustment of the tool-bar is permitted, the inner endsof the adj usting-screws bearing, respectively, on the upper and lowerfaces of the frame A.

Arranged between the arm a and the toolbar 0 on the rod 13 is a springb, the function of which is to exert a pressure to force the tool-baraway from the arm.

D, D represent set-screws extending, respectively, through the arms aand a and bearing against the tool-bar, for adjusting the lateralposition of the same.

E represents a lever pivoted in any suitable position on the frame a andprovided with a pivoted arm 6, extending through a socket on thetool-bar and retained in position by a setscrew c". On the other end ofthe lever E is a head or pointer 6 In the operation of the device, whereit is desirable to cut an opening of a size exactly corresponding tothat of any suitable article, the article to be seated is introducedbetween the tool-bar O and the head 6 on the lever, and the parts are soadjusted as to bring the article into contact with both the tool-bar andthe head. When this position is reached, the set-screw e is turned tohold the arm e firmly in the position to which it has been moved. Whenthis is accomplished, the-set-screw D is turned to bring its end to bearagainst the tool-bar and the set-screw l) is also turned 'to have itsend bear against the tool-bar.

When the parts are thus adjusted, the metal to be cut is placedagainstthe cutter and motion is imparted. After a circular hole has been out,the set-screw D is gradually loosened as the cutting proceeds, and thisloosening is continued until the head e on the lever E comes in contactwith the tool-bar, the toolbar, in the operation, being forced towardthe head by the spring I) as the set-screw D is loosened.

F represents a sliding tool-holder of the usual construction, attachedto the lathe, and which, in the use of my attachment, is preferablyarranged to support the same and prevent displacement in use.

From the foregoing, it will be clear that a circle of exactly the sizeof the article to be seated is cut, for the reason that the cutterismoved sidewise a distance exactly equal to tne radius of the circle cut,the connection between the tool-bar and the lever being such that theywill move toward each other with uniform speed, and, therefore, insurethe contact of the head 6 with the toolbar when a distance,corresponding to the radius of the circle out, has been traveled by thetool-bar.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

1. An attachment for lathes, consisting essentially, of alaterally-movable tool-bar, a pivoted lever arranged on the framecarrying the tool-bar, an adjustable connection between the lever andthe tool-bar, and a head on the lever designed to move toward and awayfrom the tool-bar, substantially as described.

2. An attachment for lathes, consisting of a laterally and verticallymovable tool-bar, a pivoted lever arranged on the frame carrying thetool-bar, an adjustable connection between the lever and the tool-bar, ahead on the lever designed to move toward and away from the tool-bar,and screws placed in the end of the tool-bar, and bearing against theframe, substantially as described.

3. An attachment for lathes, consisting in a frame, a pin arrangedacross the frame, a tool-bar sliding on the pin, a spring arrangedbetween the frame and the tool-bar, adjusting screws passing through theframe and bearing against the tool-bar, a lever mounted on the frame, anadjustable connection between the lever and the tool-bar, and a head onthe lever designed to move toward and away from the toolbar,substantially as described.

In testimony whereof I atfix my signature in presence of two witnesses.

JOHN D. RUSS. \Vitnesses:

J. B. ROBERTS, T. H. B. LEMLEY.

